Packing for portable liquid fire extinguishers



March 10, 1931. K. SCHMIDT 1,795,513

PACKING FOR PORTABLE LIQUID FIRE EXTINGUISHERS Filed Sept. 8, 1926 Patented Mar. 10, 1 931 UNITED STATES KARL SCHMIDT, F NEURUPPIN, GERMANY PACKING FOR PORTABLE LIQUID FIRE EXTINGUISHERS Application filed September 8, 1926, Serial No.

The invention relates to a packing for portable liquid fire extinguishers and more particularly for fire extinguishers of this type the extinguishing liquid of which has a detrimental action upon the fittings by either dissolving the packing materials, such as indiarubber, grease and the like or attacking the material of the fittings itself. Such an extinguishing liquid is carbon tetrachloride,

for instance.

The packing forming the object of the present invention is a substitute for the hitherto generally customary rubber rings or the like forming the packing of the fittings of fire extinguishers. The improved packing is so designed that it effectively keeps the extinguishing liquid entirely away from the closure fittings, not only during the storage of the extinguisher but also after it has been set in operation.

lVith this end in view the improved packing consists of a packing ring made of asbestos, copper or the like, for instance, to

m which is applied a metal foil of a material not attacked by the extinguishing liquid and completely or partially enclosing said ring. This metal foil is raised in its central portion and folded, corrugated or dented in suitable manner so that it is able to become deformed and stretched under the action of the striking pin serving for opening the gas developing cartridge ofthe extinguisher without tearing or breaking. ln this way the extinguishing liquid never comes in contact with the parts of the closure fittings of the extinguisher so that packings containing grease or the like may be employed for sealing the stuffing box of the striking pin, for instance.

The drawing accompanying this specification illustrates one embodiment of my invention, by way of example.

Figs. 1 and 2 show a sectional elevation of the lower part of a fire extinguisher as far as is necessary for the understanding of the invention.

Fig. 1, illustrates the position of the parts while the extinguisher is not in operation and Fig. 2, the working parts in their new 134,290, and in Germany September 8, 1925.

position after the extinguisher has been started, and

Fig. 3, is a section through the improved packing detached from the apparatus.

Like parts are indicated by like letters of reference throughout all the figures of the drawing.

Referring to Figs. 1 and 2 of the drawing, a is the lower part of a fire extinguisher upon the charging branch 5 of which a closing member cl of known construction is screwed which contains a striking pin 0. Into the charging branch 5 is inserted a gas developing cartridge or bottle 6 in well known manner which is adapted to be rendered operative by means of a striking pin 6. A ring f of asbestos, copper or the like over which a metal foil 9 is drawn serves as packing of the charging branch 12 against the closing of sealing member d. The metal foil 9 may consist of soft lead, for instance, and is on its side facing the interior of the extinguisher strongly arched and the dome thus formed is provided with countersunk, caved or dented portion h. It would, however, be within the scope of the invention to provide the metal foil with a plurality of concentric corrugations so that it would look similar to a Bourdon diaphragm, for instance.

hen the striking pin 0 of the extinguisher is driven home, it takes up the position shown in Fig. 2 of the drawing in which it has stretched or straightened the metal foil 9 from the shape shown in Fig. 1 into the shape shown in Fig. 2. During the deformation of the foil g the pressure of the striking pin is simultaneously transmitted through the foil to the bottom 2' of the gas developing cartridge 6, which may also consist of lead, for instance so that this bottom also changes its shape from that shown in Fig. 1 into that shown in Fig. 2 and smashes the fragile vessel containing the chemicals and located in the interior of the cartridge.

Various modifications and changes may be made in the details of my invention without departing from the spirit of my invention or sacrificing any of its advantages and I desire, therefore, that the claim be interpreted as limited by the state of the art only.

I claim as my invention A packing for portable liquid fire extinguishers comprising in combination, 21

packing ring and a deformable metal foil having its margin folded around the periphery of said ring.

In testimony whereof I affix my signature.

KARL SCHMIDT. 

